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Wrapping interaction in Transaction.js

Just as with Cook the Books, there's a class that wraps the Wasm interaction code and provides a clean interface. The contents of Transaction.js are very similar to the contents of /src/store/WasmTransactions.js from Cook the Books. Most of the changes accommodate for the categoryId being present in a transaction record and a single amount field (no more raw and cooked amounts). Additional functionality was added to interact with the database. For example, here's a function that edits an existing transaction, both in the database and the linked list from the Wasm instance:

getValidAmount(transaction) {  const { amount, type } = transaction;  return type === 'Withdrawal' ? -Math.abs(amount) : amount;}